Rack



FIG. 1 is a front perspective view of a rack showing my new design;

FIG. 2 is a top plan view;

FIG. 3 is a bottom perspective view;

FIG. 4 is a front elevational view, the rear, and right, and left side elevational view being a mirror image thereof; and,

FIG. 5 is a bottom plan view. 

The ornamental design for a rack, as shown and described. 